IEC 61158-4-11:2010

IEC 61158-4-11 ®
Edition 2.0 2010-08
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 4-11: Data-link layer protocol specification – Type 11 elements

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.ch
Web: www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
IEC 61158-4-11 ®
Edition 2.0 2010-08
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 4-11: Data-link layer protocol specification – Type 11 elements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XF
ICS 25.04.40; 35.100.20; 35.110 ISBN 978-2-88912-086-4
– 2 – 61158-4-11 © IEC:2010(E)
CONTENTS
FOREWORD.6
INTRODUCTION.8
1 Scope.10
1.1 General .10
1.2 Specifications.10
1.3 Procedures.10
1.4 Applicability.11
1.5 Conformance.11
2 Normative references .11
3 Terms, definitions, symbols and abbreviations.11
3.1 Reference model terms and definitions.11
3.2 Service convention terms and definitions.13
3.3 Terms and definitions .14
3.4 Symbols and abbreviations.18
4 Overview of the DL-protocol .19
4.1 General .19
4.2 Overview of the medium access control.19
4.3 Service assumed from the PhL .21
4.4 DLL architecture.21
4.5 Access control machine and schedule support functions .25
4.6 Local parameters, variables, counters, timers and queues.26
5 General structure and encoding of PhIDU and DLPDU and related elements of
procedure.43
5.1 Overview .43
5.2 PhIDU structure and encoding.43
5.3 Common MAC frame structure, encoding and elements of procedure .44
5.4 Elements of the MAC frame.44
5.5 Order of bit transmission .49
5.6 Invalid DLPDU.49
6 DLPDU-specific structure, encoding and elements of procedure .49
6.1 General .49
6.2 Synchronization DLPDU (SYN).50
6.3 Transmission complete DLPDU (CMP) .55
6.4 In-ring request DLPDU (REQ) .56
6.5 Claim DLPDU (CLM) .57
6.6 Command DLPDU (COM).58
6.7 Cyclic data and cyclic data with transmission complete DLPDU (DT) and
(DT-CMP).59
6.8 RAS DLPDU (RAS) .60
6.9 Loop repeat request DLPDU (LRR) .61
6.10 Loop diagnosis DLPDU (LPD) .65
7 DLE elements of procedure .66
7.1 DLE elements of procedure for star-architecture.66
7.2 DLE elements of procedure for loop-architecture .90
7.3 Serializer and deserializer .123
7.4 DLL management protocol.123

61158-4-11 © IEC:2010(E) – 3 –
Bibliography.134

Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses .15
Figure 2 – Basic principle of medium access control .20
Figure 3 – Interaction of PhS primitives to DLE.21
Figure 4 – Data-link layer internal architecture of star-architecture .23
Figure 5 – Data-link layer internal architecture of loop-architecture.25
Figure 6 – Common MAC frame format for DLPDUs.44
Figure 7 – Structure of FC field.45
Figure 8 – Structure of SYN DLPDU .50
Figure 9 – Structure of CMP DLPDU .55
Figure 10 – Structure of REQ DLPDU .56
Figure 11 – Structure of CLM DLPDU .57
Figure 12 – Structure of COM DLPDU.59
Figure 13 – Structure of DT DLPDU .59
Figure 14 – Structure of RAS DLPDU.60
Figure 15 – Structure of User data of loop-architecture .61
Figure 16 – Structure of LRR DLPDU.62
Figure 17 – Open-ring under control .64
Figure 18 – Structure of LPD DLPDU.65
Figure 19 – Overall structure of DLL .67
Figure 20 – DLE state transition.68
Figure 21 – State transition diagram of CTRC.70
Figure 22 – State transition diagram of STRC .73
Figure 23 – State transition diagram of ACM.77
Figure 24 – State transition diagram of RMC sending and send arbitration.85
Figure 25 – State transition diagram of RMC receiving.88
Figure 26 – Overall structure of DLL .91
Figure 27 – DLE state transition.92
Figure 28 – State transition diagram of CTRC.94
Figure 29 – State transition diagram of STRC .98
Figure 30 – State transition diagram of ACM.102
Figure 31 – State transition diagram of RMC. 112
Figure 32 – State transition diagram of DLM . 126
Figure 33 – State transition diagram of DLM . 130

Table 1 – Data-link layer components of star-architecture.22
Table 2 – Data-link layer components of loop-architecture .24
Table 3 – DLE-variables and permissible values of star-architecture.27
Table 4 – Observable variables and their value ranges of star-architecture.29
Table 5 – DLE variables and permissible values of loop-architecture .30
Table 6 – Observable variables and their value ranges of loop-architecture .32
Table 7 – F-type: DLPDU type .46

– 4 – 61158-4-11 © IEC:2010(E)
Table 8 – FCS length, polynomials and constants .47
Table 9 – PN-parameter: 3rd octet .51
Table 10 – Structure of CW: 4th octet .51
Table 11 – PM parameter .51
Table 12 – RMSEL parameter .52
Table 13 – Structure of CW: 4th octet .52
Table 14 – ST-parameter: 5th octet.52
Table 15 – Th-parameter: 6th, 7th and 8th octets.53
Table 16 – Tm-parameter: 9th and 10th octets.53
Table 17 – Ts-parameter: 11th and 12th octets .53
Table 18 – Tl-parameter: 13th and 14th octets.53
Table 19 – LL parameters: 15th to 46th octets .54
Table 20 – RN parameter.
...